how about you just deal with it and let it go? It sounds like you are just aggravating the situation. A few second of hearing a persons stereo is not going to cause deftness I assure you.
You keep recording, and telling on folks, that is guaranteed to cause you harm. My suggestion, ditch the snitch equipment, and invest in a stereo system with couple of 18 inch speakers. Hell, you might enjoy it. People need to stop being so negative. There is a silver lining to all situations. You just have to be positive enough to find that silver lining. Aslo, if you can’t find another place to live, how do you think things are going to be for them if you get them kicked out. I bet if you show them how it is affecting you, they will be more considerate. If you must snitch and feel thats your only option, just record with sound, the area of your home most affected. If it’s bouncing your chair surely it goes to knock your family heirloom ( that you bought at the flea market yesterday) off and break it. Or it’s going to rattle pictures or something. Just make sure time and dates are being recorded.